Implement ServerNoError

[ylecuyer]

Fix #113

[jgorset]

Neat, thanks! Rubocop is mad, though – I'll try to take a look at it this weekend unless you beat me to it.

[ylecuyer]

I'll try to fix 2 of them but there is one I'll have to add a local exception:

Offenses:

**This one will be fixed**

lib/facebook/messenger/server_no_error.rb:5:5: C: Missing top-level class documentation comment.
    class ServerNoError < Server
    ^^^^^

**I'll have to add a rubocop local exception for this one because it is the heart of the no exception server**

lib/facebook/messenger/server_no_error.rb:8:7: W: Avoid rescuing the Exception class. Perhaps you meant to rescue StandardError?
      rescue Exception => e ...
      ^^^^^^^^^^^^^^^^^^^^^

**This one will be fixed**

lib/facebook/messenger/server_no_error.rb:9:36: C: Use only ascii symbols in comments.
        send("\xF0\x9F\x98\xB1") # 😱
                                   ^

[ylecuyer]

191 needs to be merged first to have the build to pass

[jgorset]

:sparkles: :cake: ✨